9.3 Integration: Developing Furniture Plans & Specifications
Key Takeaways
- Furniture plans coordinate clearances, circulation, and ADA reach and turning space with the building's power, data, and structural elements; a plan that ignores power/data outlets creates visible cable runs and user frustration.
- Under ICC A117.1-2017 Section 308 the unobstructed reach range is 15 to 48 inches for both forward and side approach; the circular turning space is 67 inches in new buildings and 60 inches in existing buildings.
- Power and data coordination uses wall outlets, floor boxes, poke-throughs, and furniture-mounted panels; the designer selects the path that aligns with the furniture layout and avoids trip hazards.
- Textile performance is measured by abrasion (Martindale for European fabrics, Wyzenbeek for US) and flammability (CAL 117, UFAC); higher cycles indicate greater durability for high-traffic installations.
- Specification types are proprietary (one named product), open (any equivalent), performance (meets stated criteria), and basis-of-design (named product with allowance for equals); the choice affects cost, competition, and substitution risk.
Why Furniture Plans Matter
Furniture plans turn the space plan into an occupied environment. They locate every workstation, chair, table, storage unit, and panel; coordinate with power, data, and lighting; and ensure circulation and accessibility. A furniture plan that looks good in plan view but ignores where the power outlet lands, where the data cable routes, or whether a wheelchair user can reach the counter is a plan that fails in the field. The IDIX exam tests this multi-system coordination heavily.
Furniture Clearances and Circulation
Clearances are the spaces around and between furniture that let people move and use the furniture. Key rules:
- Aisle width — main aisles in open offices should be 36 in minimum; ADA accessible routes are 36 in minimum clear (reducible to 32 in at points for a maximum 24-in length).
- Circulation around workstations — at least 36 in between a desk edge and a wall or adjacent desk; 48 in preferred for two-way traffic.
- Reach ranges — under ICC A117.1-2017 Section 308 and the 2010 ADA Standards, the unobstructed reach range is 15 in minimum to 48 in maximum above the floor for both forward and side approach. (The 54-in high side reach is a legacy figure that A117.1-2017 retains only for existing, unaltered elements and for fuel dispensers on existing curbs.) Anything a user must operate — light switch, thermostat, card reader, shelf — must fall within the range. Obstructed reaches are lower: 44 in max over a forward obstruction deeper than 20 in, and 46 in max over a side obstruction deeper than 10 in.
- Wheelchair turning space — A117.1-2017 Section 304.3 requires a 67-in circular turning space in new buildings (60 in is retained for existing buildings, and matches the 2010 ADA Standards), or a T-shaped turning space, wherever a wheelchair user must turn around.
- Knee clearance at a forward-approach counter — 27 in high minimum, 30 in wide minimum, 19-25 in deep (varies by standard).
Furniture Coordination with Electrical and Data
Furniture needs power and data. The designer coordinates four delivery methods:
- Wall outlets — used where furniture is against a wall; the outlet must land where the furniture can reach it without a visible cable run.
- Floor boxes — recessed boxes in the slab; used in open plans where furniture is away from walls. Floor box location must align with the furniture plan; a box under a desk tower instead of under the desktop is a common coordination error.
- Poke-throughs — drilled through the slab from below; used where floor boxes cannot be cored (existing slabs, post-tensioned concrete). Less flexible than floor boxes.
- Furniture-mounted panels — power and data run inside furniture panels or raceways; used in open-office workstations. Requires coordination with the furniture manufacturer's electrified panel spec.
Common Coordination Errors
- Floor box lands under the credenza, not the desk surface — visible cable run, frustrated user.
- Wall switch behind an open door — switch is unreachable when the door is open.
- Data outlet on the wrong side of the desk — cable crosses a walkway.
- Furniture panel raceway not specified for power — electrician and furniture installer disagree on who supplies what.
Furniture Layouts
The furniture layout shows every piece in plan, keyed to a furniture schedule with manufacturer, model, finish, and quantity. The plan uses symbols for each furniture type and tags keyed to the schedule. Common layouts:
- Open office — workstations clustered around a central circulation; panels define privacy.
- Private office — desk, guest chair, credenza; layout respects the door swing and any window.
- Conference room — table sized to the room with minimum 36 in clearance to the wall; chairs pulled out add 24 in.
- Training room — tables and chairs arranged for sightlines to the screen; aisles meet egress code.
Furniture Mockups
A furniture mockup is a full-size sample of a workstation or seating configuration installed on site before the full order is placed. Mockups let the client and designer test ergonomics, proportions, finish, power routing, and lighting before committing. They are especially valuable for open-office systems where small errors multiply across hundreds of stations. The mockup is reviewed, adjusted, and then approved as the basis for the full procurement.
Furniture Sizes
Furniture is specified by size to fit the space and the user. Common dimensions:
| Item | Typical Size |
|---|---|
| Desk | 30x60 in, 30x66 in, 30x72 in |
| Credenza | 18x60 in, 18x72 in |
| Conference table (6-person) | 36x96 in |
| Guest chair | 20x22 in |
| Workstation panel | 48-65 in high (privacy); 30-42 in (collaborative) |
Quantity Takeoffs
A quantity takeoff counts every furniture item by type so procurement can order the right number. The takeoff is generated from the furniture plan: count each symbol, multiply by the schedule quantity, and sum by type. Errors — missing a room, double-counting a symbol, misreading the schedule — cascade into procurement mistakes. The takeoff is typically presented as a schedule with item, manufacturer, model, finish, and quantity.
Sourcing and Procurement Methods
Common sourcing methods:
- Open-market — buy from any vendor; flexible but no price protection.
- GSA Schedule (US federal) — pre-negotiated pricing; required for many federal projects.
- Dealer sourcing — a furniture dealer quotes a package; consolidates brands and logistics.
- Direct from manufacturer — best price but more logistics risk; typically for large orders.
Textiles, Fabric, and Finishes
Textile performance is measured by two main abrasion tests and two flammability standards:
- Martindale abrasion — European method; fabric is rubbed in a figure-eight pattern. Ratings in cycles: 15,000-20,000 for light duty; 25,000-30,000 for general commercial; 50,000+ for heavy duty.
- Wyzenbeek abrasion — US method; fabric is rubbed back and forth. Ratings in double-rubs: 15,000 for light duty; 30,000 for general commercial; 50,000+ for heavy duty.
- CAL 117 — California flammability standard for upholstered furniture; tests cigarette and small-open-flame ignition; widely adopted as a US baseline.
- UFAC (Upholstered Furniture Action Council) — industry flammability standard; similar scope to CAL 117.
The designer specifies abrasion and flammability ratings appropriate to the installation: a high-traffic lobby needs 50,000+ Wyzenbeek; a private office chair can use 15,000-30,000. Stain treatments (fluorochemical finishes, e.g., Crypton, Nano-Tex) add soil and liquid resistance and are noted in the specification.
Types of Specifications
The furniture specification tells the contractor exactly what to provide. Four types appear on the exam:
| Type | Description | Pros | Cons |
|---|---|---|---|
| Proprietary | Names one product and manufacturer; no substitutions | Precise; design intent guaranteed | No competition; higher cost |
| Open | Lists several acceptable products or performance criteria; bidder picks | Competition; lower cost | Design intent less certain |
| Performance | States required performance (abrasion, flammability, load); any product meeting it qualifies | Maximizes competition; innovation-friendly | Hard to verify equivalence; risk of under-spec |
| Basis-of-design | Names a specific product as the reference; equals may be submitted | Clear intent; some competition | Time-consuming equal review |
The designer's choice depends on the project: proprietary when design intent must be preserved (a specific signature chair); open when cost and competition matter; performance when the designer wants to encourage alternatives; basis-of-design when a specific product is preferred but substitutes are acceptable.
Exam Scenario
A designer is laying out 40 workstations in an open office. The power plan shows floor boxes in the slab; the furniture plan shows the desks 12 in off the wall. Which coordination check is most critical? The answer: confirm each floor box lands under the desktop (where the user's equipment is), not under the credenza or in the aisle. A box in the aisle is a trip hazard; a box under the credenza means a visible cable run across the floor. The designer verifies the box locations against the furniture plan before the slab is cored.
Specifying Textiles for Performance
The designer matches textile performance to the installation:
- Private office chair — 15,000-30,000 Wyzenbeek; CAL 117 sufficient; stain treatment optional.
- Open-office workstation panel — 30,000+ Wyzenbeek; CAL 117; stain treatment recommended.
- Lobby seating (high traffic) — 50,000+ Wyzenbeek or 50,000+ Martindale; CAL 117; stain treatment required.
- Healthcare waiting — 50,000+ abrasion; CAL 117; antimicrobial finish; cleanable surface.
Abrasion and flammability are minimums; the designer also considers color fastness, cleanability, pattern match, and environmental certifications (GREENGUARD, Indoor Air Quality) where the project requires them.
Furniture Specification Tips
- State the manufacturer, model, finish, and quantity in the schedule.
- Reference the basis-of-design product when allowing equals; define "equal" clearly (same material, same performance, same warranty).
- Include installation method (freight, assembly, anchoring) where the item is heavy or wall-mounted.
- Note lead time; long-lead items may require early procurement or a substitute.
For a side approach to a control or operating element, what is the ADA reach range above the floor?
A designer specifies a fabric for a high-traffic lobby seating area. Which minimum Wyzenbeek rating is most appropriate?
Which specification type names a specific product as the reference but allows submitted equals?
What is the minimum wheelchair turning space required per ICC A117.1 / ADA in a space where a wheelchair user must turn around?
A floor box in an open-office workstation lands under the credenza instead of under the desktop. What is the consequence?